citadel/netproc.c

   1 /*
   2  * Citadel/UX Intelligent Network Processor for IGnet/Open networks v3.6
   3  * Designed and written by Art Cancro @ Uncensored Communications Group
   4  * See copyright.txt for copyright information
   5  * $Id$
   6  */
   7
   8 /* How long it takes for an old node to drop off the network map */
   9 #define EXPIRY_TIME     (2592000L)
  10
  11 /* Where do we keep our lock file? */
  12 #define LOCKFILE        "/var/lock/LCK.netproc"
  13
  14 /* Path to the 'uudecode' utility (needed for network file transfers) */
  15 #define UUDECODE        "/usr/bin/uudecode"
  16
  17 /* Uncomment the DEBUG def to see noisy traces */
  18 /* #define DEBUG 1 */
  19
  20
  21 #include "sysdep.h"
  22 #include <stdlib.h>
  23 #include <unistd.h>
  24 #include <sys/types.h>
  25 #include <sys/wait.h>
  26 #include <string.h>
  27 #include <fcntl.h>
  28 #include <stdio.h>
  29 #include <ctype.h>
  30 #include <time.h>
  31 #include <signal.h>
  32 #include <errno.h>
  33 #include <syslog.h>
  34 #include "citadel.h"
  35 #include "tools.h"
  36
  37 /* A list of users you wish to filter out of incoming traffic can be kept
  38  * in ./network/filterlist -- messages from these users will be automatically
  39  * moved to FILTERROOM.  Normally this will be the same as TWITROOM (the
  40  * room problem user messages are moved to) but you can override this by
  41  * specifying a different room name here.
  42  */
  43 #ifndef FILTERROOM
  44 #define FILTERROOM TWITROOM
  45 #endif
  46
  47 struct msglist {
  48         struct msglist *next;
  49         long m_num;
  50         char m_rmname[ROOMNAMELEN];
  51         };
  52
  53 struct rmlist {
  54         struct rmlist *next;
  55         char rm_name[ROOMNAMELEN];
  56         long rm_lastsent;
  57         };
  58
  59 struct filterlist {
  60         struct filterlist *next;
  61         char f_person[64];
  62         char f_room[64];
  63         char f_system[64];
  64         };
  65
  66 struct syslist {
  67         struct syslist *next;
  68         char s_name[16];
  69         char s_type[4];
  70         char s_nexthop[128];
  71         time_t s_lastcontact;
  72         char s_humannode[64];
  73         char s_phonenum[32];
  74         char s_gdom[64];
  75         };
  76
  77
  78 void attach_to_server(int argc, char **argv);
  79 void serv_read(char *buf, int bytes);
  80 void serv_write(char *buf, int nbytes);
  81 void get_config(void);
  82
  83 struct filterlist *filter = NULL;
  84 struct syslist *slist = NULL;
  85
  86 struct config config;
  87 extern char bbs_home_directory[];
  88 extern int home_specified;
  89
  90
  91 #ifndef HAVE_STRERROR
  92 /*
  93  * replacement strerror() for systems that don't have it
  94  */
  95 char *strerror(int e)
  96 {
  97         static char buf[32];
  98
  99         sprintf(buf,"errno = %d",e);
 100         return(buf);
 101         }
 102 #endif
 103
 104
 105 void strip_trailing_whitespace(char *buf)
 106 {
 107         while(isspace(buf[strlen(buf)-1]))
 108                 buf[strlen(buf)-1]=0;
 109         }
 110
 111
 112 /*
 113  * we also load the network/mail.sysinfo table into memory, make changes
 114  * as we learn more about the network from incoming messages, and write
 115  * the table back to disk when we're done.
 116  */
 117 int load_syslist(void) {
 118         FILE *fp;
 119         struct syslist *stemp;
 120         char insys = 0;
 121         char buf[128];
 122
 123         fp=fopen("network/mail.sysinfo","rb");
 124         if (fp==NULL) return(1);
 125
 126         while(1) {
 127                 if (fgets(buf,128,fp)==NULL) {
 128                         fclose(fp);
 129                         return(0);
 130                         }
 131                 buf[strlen(buf)-1] = 0;
 132                 while (isspace(buf[0])) strcpy(buf,&buf[1]);
 133                 if (buf[0]=='#') buf[0]=0;
 134                 if ( (insys==0) && (strlen(buf)!=0) ) {
 135                         insys = 1;
 136                         stemp =(struct syslist *)malloc(sizeof(struct syslist));
 137                         stemp->next = slist;
 138                         slist = stemp;
 139                         strcpy(slist->s_name,buf);
 140                         strcpy(slist->s_type,"bin");
 141                         strcpy(slist->s_nexthop,"Mail");
 142                         slist->s_lastcontact = 0L;
 143                         strcpy(slist->s_humannode,"");
 144                         strcpy(slist->s_phonenum,"");
 145                         strcpy(slist->s_gdom,"");
 146                         }
 147                 else if ( (insys==1) && (strlen(buf)==0) ) {
 148                         insys = 0;
 149                         }
 150                 else if ( (insys==1) && (!strncmp(buf,"bin",3)) ) {
 151                         strcpy(slist->s_type,"bin");
 152                         strcpy(slist->s_nexthop,&buf[4]);
 153                         }
 154                 else if ( (insys==1) && (!strncmp(buf,"use",3)) ) {
 155                         strcpy(slist->s_type,"use");
 156                         strcpy(slist->s_nexthop,&buf[4]);
 157                         }
 158                 else if ( (insys==1) && (!strncmp(buf,"uum",3)) ) {
 159                         strcpy(slist->s_type,"uum");
 160                         strcpy(slist->s_nexthop,&buf[4]);
 161                         }
 162                 else if ( (insys==1) && (!strncmp(buf,"lastcontact",11)) ) {
 163                         sscanf(&buf[12],"%ld",&slist->s_lastcontact);
 164                         }
 165                 else if ( (insys==1) && (!strncmp(buf,"humannode",9)) ) {
 166                         strcpy(slist->s_humannode,&buf[10]);
 167                         }
 168                 else if ( (insys==1) && (!strncmp(buf,"phonenum",8)) ) {
 169                         strcpy(slist->s_phonenum,&buf[9]);
 170                         }
 171                 else if ( (insys==1) && (!strncmp(buf,"gdom",4)) ) {
 172                         strcpy(slist->s_gdom,&buf[5]);
 173                         }
 174                 }
 175         }
 176
 177 /* now we have to set up two "special" nodes on the list: one
 178  * for the local node, and one for an Internet gateway
 179  */
 180 void setup_special_nodes(void) {
 181         struct syslist *stemp,*slocal;
 182
 183         slocal = NULL;
 184         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 185                 if (!strcasecmp(stemp->s_name,config.c_nodename)) slocal=stemp;
 186                 }
 187         if (slocal==NULL) {
 188                 slocal =(struct syslist *)malloc(sizeof(struct syslist));
 189                 slocal->next = slist;
 190                 slist = slocal;
 191                 }
 192         strcpy(slocal->s_name,config.c_nodename);
 193         strcpy(slocal->s_type,"bin");
 194         strcpy(slocal->s_nexthop,"Mail");
 195         time(&slocal->s_lastcontact);
 196         strcpy(slocal->s_humannode,config.c_humannode);
 197         strcpy(slocal->s_phonenum,config.c_phonenum);
 198
 199         slocal = NULL;
 200         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 201                 if (!strcasecmp(stemp->s_name,"internet")) slocal=stemp;
 202                 }
 203         if (slocal==NULL) {
 204                 slocal =(struct syslist *)malloc(sizeof(struct syslist));
 205                 slocal->next = slist;
 206                 slist = slocal;
 207                 }
 208         strcpy(slocal->s_name,"internet");
 209         strcpy(slocal->s_type,"uum");
 210         strcpy(slocal->s_nexthop,"%s");
 211         time(&slocal->s_lastcontact);
 212         strcpy(slocal->s_humannode,"Internet Gateway");
 213         strcpy(slocal->s_phonenum,"");
 214         strcpy(slocal->s_gdom,"");
 215
 216         }
 217
 218 /*
 219  * here's the routine to write the table back to disk.
 220  */
 221 void rewrite_syslist(void) {
 222         struct syslist *stemp;
 223         FILE *newfp;
 224         time_t now;
 225
 226         time(&now);
 227         newfp=fopen("network/mail.sysinfo","w");
 228         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 229                 if (!strcasecmp(stemp->s_name,config.c_nodename)) {
 230                         time(&stemp->s_lastcontact);
 231                         strcpy(stemp->s_type,"bin");
 232                         strcpy(stemp->s_humannode,config.c_humannode);
 233                         strcpy(stemp->s_phonenum,config.c_phonenum);
 234                         }
 235             /* remove systems we haven't heard from in a while */
 236             if ( (stemp->s_lastcontact == 0L)
 237                  || (now - stemp->s_lastcontact < EXPIRY_TIME) ) {
 238                 fprintf(newfp,"%s\n%s %s\n",
 239                         stemp->s_name,stemp->s_type,stemp->s_nexthop);
 240                 if (strlen(stemp->s_phonenum) > 0)
 241                         fprintf(newfp,"phonenum %s\n",stemp->s_phonenum);
 242                 if (strlen(stemp->s_gdom) > 0)
 243                         fprintf(newfp,"gdom %s\n",stemp->s_gdom);
 244                 if (strlen(stemp->s_humannode) > 0)
 245                         fprintf(newfp,"humannode %s\n",stemp->s_humannode);
 246                 if (stemp->s_lastcontact > 0L)
 247                         fprintf(newfp,"lastcontact %ld %s",
 248                                 stemp->s_lastcontact,
 249                                 asctime(localtime(&stemp->s_lastcontact)));
 250                 fprintf(newfp,"\n");
 251                 }
 252             }
 253         fclose(newfp);
 254         /* now free the list */
 255         while (slist!=NULL) {
 256                 stemp = slist;
 257                 slist = slist->next;
 258                 free(stemp);
 259                 }
 260         }
 261
 262
 263 /* call this function with the node name of a system and it returns a pointer
 264  * to its syslist structure.
 265  */
 266 struct syslist *get_sys_ptr(char *sysname)
 267 {
 268         static char sysnambuf[16];
 269         static struct syslist *sysptrbuf = NULL;
 270         struct syslist *stemp;
 271
 272         if ( (!strcmp(sysname,sysnambuf))
 273                 && (sysptrbuf!=NULL) )  return(sysptrbuf);
 274
 275         strcpy(sysnambuf,sysname);
 276         for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 277                 if (!strcmp(sysname,stemp->s_name)) {
 278                         sysptrbuf = stemp;
 279                         return(stemp);
 280                         }
 281                 }
 282         sysptrbuf = NULL;
 283         return(NULL);
 284         }
 285
 286
 287 /*
 288  * make sure only one copy of netproc runs at a time, using lock files
 289  */
 290 int set_lockfile(void) {
 291         FILE *lfp;
 292         int onppid;
 293
 294         if ((lfp = fopen(LOCKFILE,"r")) != NULL) {
 295                 fscanf(lfp,"%d",&onppid);
 296                 fclose(lfp);
 297                 if (!kill(onppid, 0) || errno == EPERM) return 1;
 298                 }
 299
 300         lfp=fopen(LOCKFILE,"w");
 301         fprintf(lfp,"%ld\n",(long)getpid());
 302         fclose(lfp);
 303         return(0);
 304         }
 305
 306 void remove_lockfile(void) {
 307         unlink(LOCKFILE);
 308         }
 309
 310 /*
 311  * Why both cleanup() and nq_cleanup() ?  Notice the alarm() call in
 312  * cleanup() .  If for some reason netproc hangs waiting for the server
 313  * to clean up, the alarm clock goes off and the program exits anyway.
 314  * The cleanup() routine makes a check to ensure it's not reentering, in
 315  * case the ipc module looped it somehow.
 316  */
 317 void nq_cleanup(int e)
 318 {
 319         remove_lockfile();
 320         closelog();
 321         exit(e);
 322         }
 323
 324 void cleanup(int e)
 325 {
 326         static int nested = 0;
 327
 328         alarm(30);
 329         signal(SIGALRM,nq_cleanup);
 330         if (nested++ < 1) serv_puts("QUIT");
 331         nq_cleanup(e);
 332         }
 333
 334 /*
 335  * This is implemented as a function rather than as a macro because the
 336  * client-side IPC modules expect logoff() to be defined.  They call logoff()
 337  * when a problem connecting or staying connected to the server occurs.
 338  */
 339 void logoff(int e)
 340 {
 341         cleanup(e);
 342         }
 343
 344 /*
 345  * If there is a kill file in place, this function will process it.
 346  */
 347 void load_filterlist(void) {
 348         FILE *fp;
 349         struct filterlist *fbuf;
 350         char sbuf[256];
 351         int a,p;
 352         fp=fopen("./network/filterlist","r");
 353         if (fp==NULL) return;
 354         while (fgets(sbuf,256,fp)!=NULL) {
 355                 if (sbuf[0]!='#') {
 356                         sbuf[strlen(sbuf)-1]=0;
 357                         fbuf=(struct filterlist *)
 358                                 malloc((long)sizeof(struct filterlist));
 359                         fbuf->next = filter;
 360                         filter = fbuf;
 361                         strcpy(fbuf->f_person,"*");
 362                         strcpy(fbuf->f_room,"*");
 363                         strcpy(fbuf->f_system,"*");
 364                         p = (-1);
 365                         for (a=strlen(sbuf); a>=0; --a) if (sbuf[a]==',') p=a;
 366                         if (p>=0) {
 367                                 sbuf[p] = 0;
 368                                 strcpy(fbuf->f_person,sbuf);
 369                                 strcpy(sbuf,&sbuf[p+1]);
 370                                 }
 371                         for (a=strlen(sbuf); a>=0; --a) if (sbuf[a]==',') p=a;
 372                         if (p>=0) {
 373                                 sbuf[p] = 0;
 374                                 strcpy(fbuf->f_room,sbuf);
 375                                 strcpy(sbuf,&sbuf[p+1]);
 376                                 }
 377                         strcpy(fbuf->f_system,sbuf);
 378                         }
 379                 }
 380         fclose(fp);
 381         }
 382
 383 /* returns 1 if user/message/room combination is in the kill file */
 384 int is_banned(char *k_person, char *k_room, char *k_system)
 385 {
 386         struct filterlist *fptr;
 387
 388         for (fptr=filter; fptr!=NULL; fptr=fptr->next) if (
 389          ((!strcasecmp(fptr->f_person,k_person))||(!strcmp(fptr->f_person,"*")))
 390         &&
 391          ((!strcasecmp(fptr->f_room,k_room))||(!strcmp(fptr->f_room,"*")))
 392         &&
 393          ((!strcasecmp(fptr->f_system,k_system))||(!strcmp(fptr->f_system,"*")))
 394         ) return(1);
 395
 396         return(0);
 397         }
 398
 399 int get_sysinfo_type(char *name)        /* determine routing from sysinfo file */
 400              {
 401         struct syslist *stemp;
 402 GETSN:  for (stemp=slist; stemp!=NULL; stemp=stemp->next) {
 403             if (!strcasecmp(stemp->s_name,name)) {
 404                 if (!strcasecmp(stemp->s_type,"use")) {
 405                         strcpy(name,stemp->s_nexthop);
 406                         goto GETSN;
 407                         }
 408                 if (!strcasecmp(stemp->s_type,"bin")) {
 409                         return(M_BINARY);
 410                         }
 411                 if (!strcasecmp(stemp->s_type,"uum")) {
 412                         return(M_INTERNET);
 413                         }
 414                 }
 415             }
 416         syslog(LOG_ERR, "cannot find system '%s' in mail.sysinfo", name);
 417         return(-1);
 418         }
 419
 420
 421 void fpgetfield(FILE *fp, char *string)
 422 {
 423         int a,b;
 424
 425         strcpy(string,"");
 426         a=0;
 427         do {
 428                 b=getc(fp);
 429                 if (b<1) {
 430                         string[a]=0;
 431                         return;
 432                         }
 433                 string[a]=b;
 434                 ++a;
 435                 } while (b!=0);
 436         }
 437
 438
 439
 440 /*
 441  * Load all of the fields of a message, except the actual text, into a
 442  * table in memory (so we know how to process the message).
 443  */
 444 void msgfind(char *msgfile, struct minfo *buffer)
 445 {
 446         int b,e,mtype,aflag;
 447         char bbb[1024];
 448         char userid[1024];
 449         FILE *fp;
 450
 451         strcpy(userid,"");
 452         fp=fopen(msgfile,"rb");
 453         if (fp==NULL) {
 454                 syslog(LOG_ERR, "can't open message file: %s",strerror(errno));
 455                 return;
 456                 }
 457         e=getc(fp);
 458         if (e!=255) {
 459                 syslog(LOG_ERR, "incorrect message format");
 460                 goto END;
 461                 }
 462         mtype=getc(fp); aflag=getc(fp);
 463         buffer->I=0L;
 464         buffer->R[0]=0;
 465         buffer->E[0]=0;
 466         buffer->H[0]=0;
 467         buffer->S[0]=0;
 468         buffer->B[0]=0;
 469         buffer->G[0]=0;
 470
 471 BONFGM: b=getc(fp); if (b<0) goto END;
 472         if (b=='M') goto END;
 473         fpgetfield(fp,bbb);
 474         while ((bbb[0]==' ')&&(strlen(bbb)>1)) strcpy(bbb,&bbb[1]);
 475         if (b=='A') {
 476                 strcpy(buffer->A,bbb);
 477                 if (strlen(userid)==0) {
 478                         strcpy(userid,bbb);
 479                         for (e=0; e<strlen(userid); ++e)
 480                                 if (userid[e]==' ') userid[e]='_';
 481                         }
 482                 }
 483         if (b=='O') strcpy(buffer->O,bbb);
 484         if (b=='C') strcpy(buffer->C,bbb);
 485         if (b=='N') strcpy(buffer->N,bbb);
 486         if (b=='S') strcpy(buffer->S,bbb);
 487         if (b=='P') {
 488                 /* extract the user id from the path */
 489                 for (e=0; e<strlen(bbb); ++e)
 490                         if (bbb[e]=='!') strcpy(userid,&bbb[e+1]);
 491
 492                 /* now find the next hop */
 493                 for (e=0; e<strlen(bbb); ++e) if (bbb[e]=='!') bbb[e]=0;
 494                 strcpy(buffer->nexthop,bbb);
 495                 }
 496         if (b=='R') {
 497                 for (e=0; e<strlen(bbb); ++e) if (bbb[e]=='_') bbb[e]=' ';
 498                 strcpy(buffer->R,bbb);
 499                 }
 500         if (b=='D') strcpy(buffer->D,bbb);
 501         if (b=='T') buffer->T=atol(bbb);
 502         if (b=='I') buffer->I=atol(bbb);
 503         if (b=='H') strcpy(buffer->H,bbb);
 504         if (b=='B') strcpy(buffer->B,bbb);
 505         if (b=='G') strcpy(buffer->G,bbb);
 506         if (b=='E') strcpy(buffer->E,bbb);
 507         goto BONFGM;
 508
 509 END:    if (buffer->I==0L) buffer->I=buffer->T;
 510         fclose(fp);
 511         }
 512
 513 void ship_to(char *filenm, char *sysnm) /* send spool file filenm to system sysnm */
 514
 515              {
 516         char sysflnm[100];
 517         char commbuf1[100];
 518         char commbuf2[100];
 519         FILE *sysflfd;
 520
 521 #ifdef DEBUG
 522         syslog(LOG_NOTICE, "shipping %s to %s", filenm, sysnm);
 523 #endif
 524         sprintf(sysflnm,"./network/systems/%s",sysnm);
 525         sysflfd=fopen(sysflnm,"r");
 526         if (sysflfd==NULL) syslog(LOG_ERR, "cannot open %s", sysflnm);
 527         fgets(commbuf1,99,sysflfd);
 528         commbuf1[strlen(commbuf1)-1] = 0;
 529         fclose(sysflfd);
 530         sprintf(commbuf2,commbuf1,filenm);
 531         system(commbuf2);
 532         }
 533
 534 /*
 535  * proc_file_transfer()  -  handle a simple file transfer packet
 536  *
 537  */
 538 void proc_file_transfer(char *tname)
 539 {       /* name of temp file containing the whole message */
 540         char buf[256];
 541         char dest_room[ROOMNAMELEN];
 542         char subdir_name[256];
 543         FILE *tfp,*uud;
 544         int a;
 545
 546         syslog(LOG_NOTICE, "processing network file transfer...");
 547
 548         tfp=fopen(tname,"rb");
 549         if (tfp==NULL) syslog(LOG_ERR, "cannot open %s", tname);
 550         getc(tfp); getc(tfp); getc(tfp);
 551         do {
 552                 a=getc(tfp);
 553                 if (a!='M') {
 554                         fpgetfield(tfp,buf);
 555                         if (a=='O') {
 556                                 strcpy(dest_room, buf);
 557                                 }
 558                         }
 559                 } while ((a!='M')&&(a>=0));
 560         if (a!='M') {
 561                 fclose(tfp);
 562                 syslog(LOG_ERR, "no message text for file transfer");
 563                 return;
 564                 }
 565
 566         strcpy(subdir_name, "---xxx---");
 567         sprintf(buf, "GOTO %s", dest_room);
 568         serv_puts(buf);
 569         serv_gets(buf);
 570         if (buf[0]=='2') {
 571                 extract(subdir_name, &buf[4], 2);
 572                 if (strlen(subdir_name) == 0) strcpy(subdir_name, "--xxx--");
 573                 }
 574
 575         /* Change to the room's directory; if that fails, change to the
 576          * bitbucket directory.  Then run uudecode.
 577          */
 578         sprintf(buf,"(cd %s/files/%s || cd %s/files/%s ) ; exec %s",
 579                 bbs_home_directory, subdir_name,
 580                 bbs_home_directory, config.c_bucket_dir,
 581                 UUDECODE);
 582
 583         uud=(FILE *)popen(buf,"w");
 584         if (uud==NULL) {
 585                 syslog(LOG_ERR, "cannot open uudecode pipe");
 586                 fclose(tfp);
 587                 return;
 588                 }
 589
 590         fgets(buf,128,tfp);
 591         buf[strlen(buf)-1] = 0;
 592         for (a=0; a<strlen(buf); ++a) if (buf[a]=='/') buf[a]='_';
 593         fprintf(uud,"%s\n",buf);
 594         printf("netproc: %s\n",buf);
 595         while(a=getc(tfp), a>0) putc(a,uud);
 596         fclose(tfp);
 597         pclose(uud);
 598         return;
 599         }
 600
 601
 602 /* send a bounce message */
 603 void bounce(struct minfo *bminfo)
 604 {
 605
 606         FILE *bounce;
 607         char bfilename[64];
 608         static int bseq = 1;
 609         time_t now;
 610
 611         sprintf(bfilename,"./network/spoolin/bounce.%ld.%d",(long)getpid(),
 612                 bseq++);
 613         bounce = fopen(bfilename,"wb");
 614         time(&now);
 615
 616         fprintf(bounce,"%c%c%c",0xFF,MES_NORMAL,0);
 617         fprintf(bounce,"Ppostmaster%c",0);
 618         fprintf(bounce,"T%ld%c",now,0);
 619         fprintf(bounce,"APostmaster%c",0);
 620         fprintf(bounce,"OMail%c",0);
 621         fprintf(bounce,"N%s%c",config.c_nodename,0);
 622         fprintf(bounce,"H%s%c",config.c_humannode,0);
 623
 624         if (strlen(bminfo->E) > 0) {
 625                 fprintf(bounce,"R%s%c",bminfo->E,0);
 626                 }
 627         else {
 628                 fprintf(bounce,"R%s%c",bminfo->A,0);
 629                 }
 630
 631         fprintf(bounce,"D%s%c",bminfo->N,0);
 632         fprintf(bounce,"M%s could not deliver your mail to:\n",
 633                 config.c_humannode);
 634         fprintf(bounce," \n %s\n \n",bminfo->R);
 635         fprintf(bounce," because there is no such user on this system.\n");
 636         fprintf(bounce," (Unsent message does *not* follow.  ");
 637         fprintf(bounce,"Help to conserve bandwidth.)\n%c",0);
 638         fclose(bounce);
 639         }
 640
 641
 642
 643 /*
 644  * process incoming files in ./network/spoolin
 645  */
 646 void inprocess(void) {
 647         FILE *fp,*message,*testfp,*ls;
 648         static struct minfo minfo;
 649         struct recentmsg recentmsg;
 650         char tname[128],aaa[1024],iname[256],sfilename[256],pfilename[256];
 651         int a,b;
 652         int FieldID;
 653         struct syslist *stemp;
 654         char *ptr = NULL;
 655         char buf[256];
 656         long msglen;
 657         int bloklen;
 658
 659
 660         sprintf(tname,"/tmp/net.t%ld",(long)getpid());  /* temp file name */
 661         sprintf(iname,"/tmp/net.i%ld",(long)getpid());  /* temp file name */
 662
 663         load_filterlist();
 664
 665         chdir(bbs_home_directory);
 666
 667         /* Let the shell do the dirty work. Get all data from spoolin */
 668     do {
 669         sprintf(aaa,"cd %s/network/spoolin; ls",bbs_home_directory);
 670         ls=popen(aaa,"r");
 671         if (ls==NULL) {
 672                 syslog(LOG_ERR, "could not open dir cmd: %s", strerror(errno));
 673                 }
 674         if (ls!=NULL) {
 675                 do {
 676 SKIP:                   ptr=fgets(sfilename, sizeof sfilename, ls);
 677                         if (ptr!=NULL) {
 678                                 sfilename[strlen(sfilename)-1] = 0;
 679                                 if (!strcmp(sfilename, ".")) goto SKIP;
 680                                 if (!strcmp(sfilename, "..")) goto SKIP;
 681                                 if (!strcmp(sfilename, "CVS")) goto SKIP;
 682                                 goto PROCESS_IT;
 683                                 }
 684                         } while(ptr!=NULL);
 685 PROCESS_IT:     pclose(ls);
 686                 }
 687
 688       if (ptr!=NULL) {
 689         sprintf(pfilename,"%s/network/spoolin/%s",bbs_home_directory,sfilename);
 690         syslog(LOG_NOTICE, "processing <%s>", pfilename);
 691
 692         fp = fopen(pfilename, "rb");
 693         if (fp == NULL) {
 694             syslog(LOG_ERR, "cannot open %s: %s", pfilename, strerror(errno));
 695             fp = fopen("/dev/null" ,"rb");
 696             }
 697
 698 NXMSG:  /* Seek to the beginning of the next message */
 699         do {
 700                 a=getc(fp);
 701                 } while((a!=255)&&(a>=0));
 702         if (a<0) goto ENDSTR;
 703
 704         message = fopen(tname,"wb");    /* This crates the temporary file. */
 705         if (message == NULL) {
 706                 syslog(LOG_ERR, "error creating %s: %s", tname,strerror(errno));
 707                 goto ENDSTR;
 708                 }
 709         putc(255,message);              /* 0xFF (start-of-message) */
 710         a = getc(fp); putc(a, message); /* type */
 711         a = getc(fp); putc(a, message); /* mode */
 712         do {
 713                 FieldID = getc(fp);     /* Header field ID */
 714                 putc(FieldID, message);
 715                 do {
 716                         a = getc(fp);
 717                         putc(a, message);
 718                         } while (a > 0);
 719                 } while ((FieldID != 'M') && (a >= 0)); /* M is always last */
 720
 721         msglen = ftell(message);
 722         fclose(message);
 723
 724         /* process the individual mesage */
 725         minfo.D[0]=0;
 726         minfo.C[0]=0;
 727         minfo.B[0]=0;
 728         minfo.G[0]=0;
 729         minfo.R[0]=0;
 730         msgfind(tname,&minfo);
 731         strncpy(recentmsg.RMnodename,minfo.N,9);
 732         recentmsg.RMnodename[9]=0;
 733         recentmsg.RMnum=minfo.I;
 734         syslog(LOG_NOTICE, "#%ld fm <%s> in <%s> @ <%s>",
 735                 minfo.I,minfo.A,minfo.O,minfo.N);
 736         if (strlen(minfo.R)>0) {
 737                 syslog(LOG_NOTICE, "     to <%s>",minfo.R);
 738                 if (strlen(minfo.D)>0) {
 739                         syslog(LOG_NOTICE, "     @ <%s>",minfo.D);
 740                         }
 741                 }
 742         if (!strcasecmp(minfo.D,FQDN)) strcpy(minfo.D,NODENAME);
 743
 744         /* this routine updates our info on the system that sent the message */
 745         stemp = get_sys_ptr(minfo.N);
 746         if ((stemp == NULL) && (get_sys_ptr(minfo.nexthop) != NULL)) {
 747                 /* add non-neighbor system to map */
 748                 syslog(LOG_NOTICE, "Adding non-neighbor system <%s> to map",
 749                         slist->s_name);
 750                 stemp = (struct syslist *)malloc((long)sizeof(struct syslist));
 751                 stemp->next = slist;
 752                 slist = stemp;
 753                 strcpy(slist->s_name,minfo.N);
 754                 strcpy(slist->s_type,"use");
 755                 strcpy(slist->s_nexthop,minfo.nexthop);
 756                 time(&slist->s_lastcontact);
 757                 }
 758         else if ((stemp == NULL) && (!strcasecmp(minfo.N,minfo.nexthop))) {
 759                 /* add neighbor system to map */
 760                 syslog(LOG_NOTICE, "Adding neighbor system <%s> to map",
 761                         slist->s_name);
 762                 sprintf(aaa,"%s/network/systems/%s",bbs_home_directory,minfo.N);
 763                 testfp=fopen(aaa,"r");
 764                 if (testfp!=NULL) {
 765                         fclose(testfp);
 766                         stemp = (struct syslist *)
 767                                 malloc((long)sizeof(struct syslist));
 768                         stemp->next = slist;
 769                         slist = stemp;
 770                         strcpy(slist->s_name,minfo.N);
 771                         strcpy(slist->s_type,"bin");
 772                         strcpy(slist->s_nexthop,"Mail");
 773                         time(&slist->s_lastcontact);
 774                         }
 775                 }
 776         /* now update last contact and long node name if we can */
 777         if (stemp!=NULL) {
 778                 time(&stemp->s_lastcontact);
 779                 if (strlen(minfo.H) > 0) strcpy(stemp->s_humannode,minfo.H);
 780                 if (strlen(minfo.B) > 0) strcpy(stemp->s_phonenum,minfo.B);
 781                 if (strlen(minfo.G) > 0) strcpy(stemp->s_gdom,minfo.G);
 782                 }
 783
 784         /* route the message if necessary */
 785         if ((strcasecmp(minfo.D,NODENAME))&&(minfo.D[0]!=0)) {
 786                 a = get_sysinfo_type(minfo.D);
 787                 syslog(LOG_NOTICE, "routing message to system <%s>", minfo.D);
 788                 fflush(stdout);
 789                 if (a==M_INTERNET) {
 790                         if (fork()==0) {
 791                                 syslog(LOG_NOTICE, "netmailer %s", tname);
 792                                 fflush(stdout);
 793                                 execlp("./netmailer","netmailer",
 794                                         tname,NULL);
 795                                 syslog(LOG_ERR, "error running netmailer: %s",
 796                                         strerror(errno));
 797                                 exit(errno);
 798                                 }
 799                         else while (wait(&b)!=(-1));
 800                         }
 801                 else if (a==M_BINARY) {
 802                         ship_to(tname,minfo.D);
 803                         }
 804                 else {
 805                         /* message falls into the bit bucket? */
 806                         }
 807                 }
 808
 809         /* check to see if it's a file transfer */
 810         else if (!strncasecmp(minfo.S,"FILE",4)) {
 811                 proc_file_transfer(tname);
 812                 }
 813
 814         /* otherwise process it as a normal message */
 815         else {
 816
 817                 if (!strcasecmp(minfo.R, "postmaster")) {
 818                         strcpy(minfo.R, "");
 819                         strcpy(minfo.C, "Aide");
 820                         }
 821
 822                 if (strlen(minfo.R) > 0) {
 823                         sprintf(buf,"GOTO _MAIL_");
 824                         }
 825                 if (is_banned(minfo.A,minfo.C,minfo.N)) {
 826                         sprintf(buf,"GOTO %s", FILTERROOM);
 827                         }
 828                 else {
 829                         if (strlen(minfo.C) > 0) {
 830                                 sprintf(buf,"GOTO %s", minfo.C);
 831                                 }
 832                         else {
 833                                 sprintf(buf,"GOTO %s", minfo.O);
 834                                 }
 835                         }
 836                 serv_puts(buf);
 837                 serv_gets(buf);
 838                 if (buf[0] != '2') {
 839                         syslog(LOG_ERR, "%s", buf);
 840                         sprintf(buf,"GOTO _BITBUCKET_");
 841                         serv_puts(buf);
 842                         serv_gets(buf);
 843                         }
 844
 845                 /* Open the temporary file containing the message */
 846                 message = fopen(tname, "rb");
 847                 if (message == NULL) {
 848                         syslog(LOG_ERR, "cannot open %s: %s",
 849                                 tname, strerror(errno));
 850                         unlink(tname);
 851                         goto NXMSG;
 852                         }
 853
 854                 /* Transmit the message to the server */
 855                 sprintf(buf, "ENT3 1|%s|%ld", minfo.R, msglen);
 856                 serv_puts(buf);
 857                 serv_gets(buf);
 858                 if (!strncmp(buf, "570", 3)) {
 859                         /* no such user, do a bounce */
 860                         bounce(&minfo);
 861                         }
 862                 if (buf[0] == '7') {
 863                         /* Always use the server's idea of the message length,
 864                          * even though they should both be identical */
 865                         msglen = atol(&buf[4]);
 866                         while (msglen > 0L) {
 867                                 bloklen = ((msglen >= 255L) ? 255 : ((int)msglen));
 868                                 if (fread(buf, bloklen, 1, message) < 1) {
 869                                         syslog(LOG_ERR,
 870                                            "error trying to read %d bytes: %s",
 871                                            bloklen, strerror(errno));
 872                                         }
 873                                 serv_write(buf, bloklen);
 874                                 msglen = msglen - (long)bloklen;
 875                                 }
 876                         serv_puts("NOOP");
 877                         serv_gets(buf);
 878                         }
 879                 else {
 880                         syslog(LOG_ERR, "%s", buf);
 881                         }
 882
 883                 fclose(message);
 884                 }
 885
 886         unlink(tname);
 887         goto NXMSG;
 888
 889 ENDSTR: fclose(fp);
 890         unlink(pfilename);
 891         }
 892       } while(ptr!=NULL);
 893     unlink(iname);
 894     }
 895
 896
 897 int checkpath(char *path, char *sys)    /* Checks to see whether its ok to send */
 898                         /* Returns 1 for ok, send message       */
 899             {           /* Returns 0 if message already there   */
 900         int a;
 901         char sys2[512];
 902         strcpy(sys2,sys);
 903         strcat(sys2,"!");
 904
 905 #ifdef DEBUG
 906         syslog(LOG_NOTICE, "checkpath <%s> <%s> ... ", path, sys);
 907 #endif
 908         for (a=0; a<strlen(path); ++a) {
 909                 if (!strncmp(&path[a],sys2,strlen(sys2))) return(0);
 910                 }
 911         return(1);
 912         }
 913
 914 /*
 915  * implement split horizon algorithm
 916  */
 917 int ismsgok(long int mpos, FILE *mmfp, char *sysname)
 918 {
 919         int a;
 920         int ok = 0;             /* fail safe - no path, don't send it */
 921         char fbuf[256];
 922
 923         fseek(mmfp,mpos,0);
 924         if (getc(mmfp)!=255) return(0);
 925         getc(mmfp); getc(mmfp);
 926
 927         while (a=getc(mmfp),((a!='M')&&(a!=0))) {
 928                 fpgetfield(mmfp,fbuf);
 929                 if (a=='P') {
 930                         ok = checkpath(fbuf,sysname);
 931                         }
 932                 }
 933 #ifdef DEBUG
 934         syslog(LOG_NOTICE, "%s", ((ok)?"SEND":"(no)") );
 935 #endif
 936         return(ok);
 937         }
 938
 939 int spool_out(struct msglist *cmlist, FILE *destfp, char *sysname)      /* spool list of messages to a file */
 940                                         /* returns # of msgs spooled */
 941
 942
 943 {
 944         struct msglist *cmptr;
 945         FILE *mmfp;
 946         char mmtemp[128];
 947         char fbuf[128];
 948         int a;
 949         int msgs_spooled = 0;
 950         long msg_len;
 951         int blok_len;
 952
 953         char buf[256];
 954         char curr_rm[256];
 955
 956         strcpy(curr_rm, "");
 957         sprintf(mmtemp, "/tmp/net.m%ld", (long)getpid());
 958
 959         /* for each message in the list... */
 960         for (cmptr=cmlist; cmptr!=NULL; cmptr=cmptr->next) {
 961
 962                 /* make sure we're in the correct room... */
 963                 if (strcasecmp(curr_rm, cmptr->m_rmname)) {
 964                         sprintf(buf, "GOTO %s", cmptr->m_rmname);
 965                         serv_puts(buf);
 966                         serv_gets(buf);
 967                         if (buf[0] == '2') {
 968                                 strcpy(curr_rm, cmptr->m_rmname);
 969                                 }
 970                         else {
 971                                 syslog(LOG_ERR, "%s", buf);
 972                                 }
 973                         }
 974
 975                 /* download the message from the server... */
 976                 mmfp = fopen(mmtemp, "wb");
 977                 sprintf(buf, "MSG3 %ld", cmptr->m_num);
 978                 serv_puts(buf);
 979                 serv_gets(buf);
 980                 if (buf[0]=='6') {                      /* read the msg */
 981                         msg_len = atol(&buf[4]);
 982                         while (msg_len > 0L) {
 983                                 blok_len = ((msg_len >= 256L) ? 256 : (int)msg_len);
 984                                 serv_read(buf, blok_len);
 985                                 fwrite(buf, blok_len, 1, mmfp);
 986                                 msg_len = msg_len - (long)blok_len;
 987                                 }
 988                         }
 989                 else {                                  /* or print the err */
 990                         syslog(LOG_ERR, "%s", buf);
 991                         }
 992                 fclose(mmfp);
 993
 994                 mmfp = fopen(mmtemp,"rb");
 995
 996                 if (ismsgok(0L,mmfp,sysname)) {
 997                         ++msgs_spooled;
 998                         fflush(stdout);
 999                         fseek(mmfp,0L,0);
1000                         fread(fbuf,3,1,mmfp);
1001                         fwrite(fbuf,3,1,destfp);
1002                         while (a=getc(mmfp),((a!=0)&&(a!='M'))) {
1003                                 if (a!='C') putc(a,destfp);
1004                                 fpgetfield(mmfp,fbuf);
1005                                 if (a=='P') fprintf(destfp,"%s!",NODENAME);
1006                                 if (a!='C')
1007                                         fwrite(fbuf,strlen(fbuf)+1,1,destfp);
1008                                 }
1009                         if (a=='M') {
1010                                 fprintf(destfp, "C%s%c",
1011                                         cmptr->m_rmname, 0);
1012                                 putc('M',destfp);
1013                                 do {
1014                                         a=getc(mmfp);
1015                                         putc(a,destfp);
1016                                         } while(a>0);
1017                                 }
1018                         }
1019                 fclose(mmfp);
1020                 }
1021
1022         unlink(mmtemp);
1023         return(msgs_spooled);
1024         }
1025
1026 void outprocess(char *sysname) /* send new room messages to sysname */
1027                {
1028         char sysflnm[64];
1029         char srmname[32];
1030         char shiptocmd[128];
1031         char lbuf[64];
1032         char tempflnm[64];
1033         char buf[256];
1034         struct msglist *cmlist = NULL;
1035         struct rmlist *crmlist = NULL;
1036         struct rmlist *rmptr,*rmptr2;
1037         struct msglist *cmptr,*cmptr2;
1038         FILE *sysflfp,*tempflfp;
1039         int outgoing_msgs;
1040         long thismsg;
1041
1042         sprintf(tempflnm,"/tmp/%s.%ld",NODENAME,(long)getpid());
1043         tempflfp=fopen(tempflnm,"w");
1044         if (tempflfp==NULL) return;
1045
1046
1047 /*
1048  * Read system file for node in question and put together room list
1049  */
1050         sprintf(sysflnm,"%s/network/systems/%s",bbs_home_directory,sysname);
1051         sysflfp=fopen(sysflnm,"r");
1052         if (sysflfp==NULL) return;
1053         fgets(shiptocmd,128,sysflfp); shiptocmd[strlen(shiptocmd)-1]=0;
1054         while(!feof(sysflfp)) {
1055                 if (fgets(srmname,32,sysflfp)==NULL) break;
1056                 srmname[strlen(srmname)-1]=0;
1057                 fgets(lbuf,32,sysflfp);
1058                 rmptr=(struct rmlist *)malloc(sizeof(struct rmlist));
1059                 rmptr->next = NULL;
1060                 strcpy(rmptr->rm_name,srmname);
1061                 strip_trailing_whitespace(rmptr->rm_name);
1062                 rmptr->rm_lastsent = atol(lbuf);
1063                 if (crmlist==NULL) crmlist=rmptr;
1064                 else if (!strcasecmp(rmptr->rm_name,"control")) {
1065                         /* control has to be first in room list */
1066                         rmptr->next = crmlist;
1067                         crmlist = rmptr;
1068                         }
1069                 else {
1070                         rmptr2=crmlist;
1071                         while (rmptr2->next != NULL) rmptr2=rmptr2->next;
1072                         rmptr2->next=rmptr;
1073                         }
1074                 }
1075         fclose(sysflfp);
1076
1077 /*
1078  * Assemble list of messages to be spooled
1079  */
1080         for (rmptr=crmlist; rmptr!=NULL; rmptr=rmptr->next) {
1081
1082                 sprintf(buf,"GOTO %s",rmptr->rm_name);
1083                 serv_puts(buf);
1084                 serv_gets(buf);
1085                 if (buf[0]!='2') {
1086                         syslog(LOG_ERR, "%s", buf);
1087                         }
1088                 else {
1089                         sprintf(buf, "MSGS GT|%ld", rmptr->rm_lastsent);
1090                         serv_puts(buf);
1091                         serv_gets(buf);
1092                         if (buf[0]=='1') while (serv_gets(buf), strcmp(buf,"000")) {
1093                                 thismsg = atol(buf);
1094                                 if ( thismsg > (rmptr->rm_lastsent) ) {
1095                                         rmptr->rm_lastsent = thismsg;
1096
1097                                 cmptr=(struct msglist *)
1098                                       malloc(sizeof(struct msglist));
1099                                         cmptr->next = NULL;
1100                                         cmptr->m_num = thismsg;
1101                                         strcpy(cmptr->m_rmname, rmptr->rm_name);
1102
1103                                         if (cmlist == NULL) cmlist = cmptr;
1104                                         else {
1105                                                 cmptr2 = cmlist;
1106                                                 while (cmptr2->next != NULL)
1107                                                 cmptr2 = cmptr2->next;
1108                                                 cmptr2->next = cmptr;
1109                                                 }
1110                                         }
1111                                 }
1112                         else {          /* print error from "msgs all" */
1113                                 syslog(LOG_ERR, "%s", buf);
1114                                 }
1115                         }
1116                 }
1117
1118         outgoing_msgs=0; cmptr2=cmlist; /* this loop counts the messages */
1119         while (cmptr2!=NULL) {
1120                 ++outgoing_msgs;
1121                 cmptr2 = cmptr2->next;
1122                 }
1123         syslog(LOG_NOTICE, "%d messages to be spooled to %s",
1124                 outgoing_msgs,sysname);
1125
1126 /*
1127  * Spool out the messages, but only if there are any.
1128  */
1129         if (outgoing_msgs!=0) outgoing_msgs=spool_out(cmlist,tempflfp,sysname);
1130         syslog(LOG_NOTICE, "%d messages actually spooled",
1131                 outgoing_msgs);
1132
1133 /*
1134  * Deallocate list of spooled messages.
1135  */
1136         while(cmlist!=NULL) {
1137                 cmptr=cmlist->next;
1138                 free(cmlist);
1139                 cmlist=cmptr;
1140                 }
1141
1142 /*
1143  * Rewrite system file and deallocate room list.
1144  */
1145         syslog(LOG_NOTICE, "Spooling...");
1146         sysflfp=fopen(sysflnm,"w");
1147         fprintf(sysflfp,"%s\n",shiptocmd);
1148         for (rmptr=crmlist; rmptr!=NULL; rmptr=rmptr->next)
1149                 fprintf(sysflfp,"%s\n%ld\n",rmptr->rm_name,rmptr->rm_lastsent);
1150         fclose(sysflfp);
1151         while(crmlist!=NULL) {
1152                 rmptr=crmlist->next;
1153                 free(crmlist);
1154                 crmlist=rmptr;
1155                 }
1156
1157 /*
1158  * Close temporary file, ship it out, and return
1159  */
1160         fclose(tempflfp);
1161         if (outgoing_msgs!=0) ship_to(tempflnm,sysname);
1162         unlink(tempflnm);
1163         }
1164
1165
1166 /*
1167  * Connect netproc to the Citadel server running on this computer.
1168  */
1169 void np_attach_to_server(void) {
1170         char buf[256];
1171         char portname[8];
1172         char *args[] = { "netproc", "localhost", NULL, NULL } ;
1173
1174         syslog(LOG_NOTICE, "Attaching to server...");
1175         sprintf(portname, "%d", config.c_port_number);
1176         args[2] = portname;
1177         attach_to_server(3, args);
1178         serv_gets(buf);
1179         syslog(LOG_NOTICE, "%s", &buf[4]);
1180         sprintf(buf,"IPGM %d", config.c_ipgm_secret);
1181         serv_puts(buf);
1182         serv_gets(buf);
1183         syslog(LOG_NOTICE, "%s", &buf[4]);
1184         if (buf[0]!='2') {
1185                 cleanup(2);
1186                 }
1187         }
1188
1189
1190
1191 /*
1192  * main
1193  */
1194 int main(int argc, char **argv)
1195 {
1196         char allst[32];
1197         FILE *allfp;
1198         int a;
1199         int import_only = 0;    /* if set to 1, don't export anything */
1200
1201         openlog("netproc", LOG_PID, LOG_USER);
1202         strcpy(bbs_home_directory, BBSDIR);
1203
1204         /*
1205          * Change directories if specified
1206          */
1207         for (a=1; a<argc; ++a) {
1208                 if (!strncmp(argv[a], "-h", 2)) {
1209                         strcpy(bbs_home_directory, argv[a]);
1210                         strcpy(bbs_home_directory, &bbs_home_directory[2]);
1211                         home_specified = 1;
1212                         }
1213                 else if (!strcmp(argv[a], "-i")) {
1214                         import_only = 1;
1215                         }
1216                 else {
1217                         fprintf(stderr, "netproc: usage: ");
1218                         fprintf(stderr, "netproc [-hHomeDir] [-i]\n");
1219                         exit(1);
1220                         }
1221                 }
1222
1223         get_config();
1224
1225         if (set_lockfile()!=0) {
1226                 syslog(LOG_NOTICE, "lock file exists: already running");
1227                 cleanup(1);
1228                 }
1229
1230         signal(SIGINT,cleanup);
1231         signal(SIGQUIT,cleanup);
1232         signal(SIGHUP,cleanup);
1233         signal(SIGTERM,cleanup);
1234
1235         syslog(LOG_NOTICE, "started.  pid=%d", getpid());
1236         fflush(stdout);
1237         np_attach_to_server();
1238         fflush(stdout);
1239
1240         if (load_syslist()!=0) syslog(LOG_ERR, "cannot load sysinfo");
1241         setup_special_nodes();
1242
1243         inprocess();    /* first collect incoming stuff */
1244
1245         if (import_only != 1) {
1246                 allfp=(FILE *)popen("cd ./network/systems; ls","r");
1247                 if (allfp!=NULL) {
1248                         while (fgets(allst,32,allfp)!=NULL) {
1249                                 allst[strlen(allst)-1] = 0;
1250                                 outprocess(allst);
1251                                 }
1252                         pclose(allfp);
1253                         }
1254                 /* import again in case anything new was generated */
1255                 inprocess();
1256                 }
1257
1258         rewrite_syslist();
1259         syslog(LOG_NOTICE, "processing ended.");
1260         cleanup(0);
1261         return 0;
1262         }